Rails7でJSライブラリを使う方法

./bin/importmap pin ライブラリ名

$ .bin/importmap pin slim-select
Pinning "slim-select" to https://ga.jspm.io/npm:slim-select@1.27.1/dist/slimselect.min.mjs

# Pin npm packages by running ./bin/importmap

pin "application", preload: true
pin "@hotwired/turbo-rails", to: "turbo.min.js", preload: true
pin "@hotwired/stimulus", to: "stimulus.min.js", preload: true
pin "@hotwired/stimulus-loading", to: "stimulus-loading.js", preload: true
pin_all_from "app/javascript/controllers", under: "controllers"
pin "slim-select", to: "https://ga.jspm.io/npm:slim-select@1.27.1/dist/slimselect.min.mjs" # 追加される

import { Controller } from "@hotwired/stimulus"
import SlimSelect from "slim-select"

export default class extends Controller {
  connect() {
    this.select = new SlimSelect({
      select: this.element
    })
  }

  disconnect() {
    this.select.destroy()
  }
}

<%= form.select :category, ["ruby", "php"], { include_blank: true }, data: { controller: "select" } %>

/*
 * This is a manifest file that'll be compiled into application.css, which will include all the files
 * listed below.
 *
 * Any CSS (and SCSS, if configured) file within this directory, lib/assets/stylesheets, or any plugin's
 * vendor/assets/stylesheets directory can be referenced here using a relative path.
 *
 * You're free to add application-wide styles to this file and they'll appear at the bottom of the
 * compiled file so the styles you add here take precedence over styles defined in any other CSS
 * files in this directory. Styles in this file should be added after the last require_* statement.
 * It is generally better to create a new file per style scope.
 *
 *= require_tree .
 *= require_self
 */

@import url("https://cdnjs.cloudflare.com/ajax/libs/slim-select/1.27.1/slimselect.min.css");